Image reading apparatus, control method, and computer-readable, non-transitory medium
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United States of America Patent
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Jan 2, 2018
Issued Date -
N/A
app pub date -
Jun 9, 2016
filing date -
Mar 3, 2016
priority date (Note) -
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Abstract
An image reading apparatus includes an image capturing module, a reference member, a light source for emitting light to the reference member, a foreign object determining module for determining whether or not a foreign object appears in a specific image, and a position determining module for determining whether the foreign object exists on the image capturing module side or on the reference member side, based on an absolute value of a difference between a gradation value in a region included in two images and corresponding to a region where the foreign object appears when the foreign object appears in the specific image. One image is an image of the reference member captured under illumination of light with a first light quantity from the light source, and other image is an image of the reference member captured under illumination of light with a second light quantity from the light source.
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